Sophia Bush, who was on one tree hill and is now on Chicago PD , took to Instagram on Saturday to share her shock over the death of ex-boyfriend Dan Fredinburg, a Google executive who was killed following the massive earthquake in Nepal this weekend.

Fredinburg was privacy director for the company’s Google X team, which is responsible for some of the search company’s more forward-thinking initiatives, including driverless cars and Google Glass.

A frequent and experienced climber, Fredinburg was scaling Everest with two other Google (GOOGL, Tech30) employees this weekend, while a 7.8-magnitude earthquake caused an avalanche.